Radio apparatus



Patented July 1, 1930 nwme NACKUHSOHN,

01' CHICAGO, ILLINOIS RADIO APPARATUS Application filed December 1, 1926. Serial ire. 151,851.

My invention relates to the improvement in radio apparatus and more particularly to the structure associated with and supporting the various parts of a radio receiver. It con- 5 sists of the combinations, constructions. and

arrangements hereinafter set forth, lllustrated in accompanying drawings and more particularly pointed out in the appended claims.

Amon the objects of my invention are: to provi e a device of the character descrlbed that will form a relatively simplesupport, or chassis, for the units such as inductances, capacities, vacuum tubes, etc. that go into a radio receiving set; to provide a panel on which the usual tuning control knobs can be mounted and a base portion mounted integrally with said panel for supporting other apparatus, thus eliminating the conventional brackets commonly used in radio receivers for securing the panel to the base-board. Also, since a large portion of the units have a common electrical connection, such as earth, it is desirable to ground such units as are necessary to the chassis, thereby obviating the necessityof running separate wires zforthls purpose between the units. Moreover, many circuits used in radio receivers require a capacity between certain parts or conductors,

and earth. Ordinarily a condenser havmg a capacity of .25 microfarads or greater is used for this purpose and one side of this condenser is connectedto earth. In my improvement the conducting chassis forms one plate of this condenser and a dielectric, such as a sheet of mica, is secured thereto by .a second conducting plate forming the remainder of the condenser. The shape of the attached conducting plate may be such as to form some of the wiring of the set.

Other and further objects and advantages will appear as the specification progresses with reference to the accompanying drawin and novel features will be particularly pointed out in the appended claims.

In the drawing, Fig. 1 is a pers ective view showing the preferred form of t e improvement; Fig. 2 discloses the bottom of the base portion and shows the out of the 50 condenser plates.

a With reference to Figs. 1 and 2, the portion of the chassis forming the panel onto which the tuning control knobs and associate apparatus may be mounted is shown at 1. Formed integrally therewith and in perpendicular relation thereto is a base portion 2. To the rear of said base and extending in perpendicularrelation is a vertical portion 3 to the upper end of which is fastened a panel 4 made of suitable insulating material. This panel 00 may be used for mounting the vacuum tube sockets, binding posts, etc.

The entire metallic chassis may form part "of the electrical circuit, preferably that part of the circuit which is connected to ground. In order to form a capacity between this common ground connection and any desired parts of the circuit the chassis is utilized as a part of a condenser, having fastened thereto a metallic plate 5 separated from the base 'portion 2 by a sheet of dielectric material 6. While the capacity plate 5 is shown with lead wires 7 fastened thereto, it is obvious that said plate may be made integrally with the wires 7 or with any other predetermined 7 portion of the wiring.

It is obvious that numerous changes may be made in details set forth without departure from the spirit and scope of the invention as defined in the claims.

I claim:

1. In a radio apparatus, the combination with an electro-conductive chassis, of an electro-conductive member arranged for electrical connection with chassis mounted units, I and a dielectric between said chassis and member whereby to form a condenser.

2. In a radio receiver including a metal chassis, a condenser, said chassis forming one side thereof.

3. The combination, in a radio apparatus including a. grounded metal unit supporting member, of a dielectric element having surface contact with said unit supporting memher, and an electro-oonductive member hav- 98 ing surface contact with said dielectric element and arra ed for electrical connection with units on said supporting member.

4. A radio chassis comprising a metal plate formed with a flat face portion conml stituting a control panel, a section ofsaid plate being bent upwardly upon itself from the bottom edge of the control panel for a short distance and then bent laterally rearward from the control panel to form a unit supporting section, said plate having an upwar-(ll y bent rear wall formed at the edge of the unit supporting section opposite to the control panel, and an integral ateral ledge portion formed at the top of said rear wall section.

5. In a radio apparatus, a chassis comprising a one piece metal plate bent upon itself to provide a frontcontrol panel, a rear wall panel, and a unit supporting section extending between the control panel and the rear wall panel, said unit su porting section being elevated above the ottom edge of the control panel.

6. In a radio apparatus, a grounded metal shield plate, a strip of dielectric material disposed over an area of said plate, a strip of electro-conductive material disposed over an area of said dielectric and out of contact with said plate, and means securing said plate, dielectric material and electro-conductive strip in associated attached relation.

7. In a radio apparatus, the combination with a metal supporting member, of an elec-' tro-conductive member arranged for electrical connection with means held by said supporting member, and a dielectric between said supporting member and said electroconductive member whereby to form a condenser.

8. In a radio apparatus, the combination with an eleetro-conductive chassis, of an electro-conductive member capaeitively associated therewith, and a dielectric between said chassis and member.

IRVING NACHUMS OHN. 

